Most Russians belong to an intermediate chronotype known as pigeons rather than larks or owls, neurologist Yulia Prokofieva told Gazeta.Ru.

Citing various studies, Prokofieva noted that larks account for 15 to 20 percent of the population and owls make up 15 to 25 percent. Pigeons comprise about 50 to 60 percent, meaning more than half of Russians fit into the intermediate category.
Characteristics and Circadian Rhythms
Prokofieva identified the key strength of people with the pigeon chronotype as their ability to adapt to different daily routines. The existence of different chronotypes stems from human circadian rhythms, allowing intermediate types to adjust relatively easily to schedule changes, time zone shifts, and varied living conditions.
People with this chronotype generally go to bed around midnight and wake up at 7:00 or 8:00 a.m. Their peak productivity occurs during daytime hours, roughly from 10:00 to 18:00.
Sleep Habits and Brain Aging
Separately, nutritionists Cheri Gao and Sheila Patterson recommended avoiding chocolate, alcohol, coffee, and soda after 17:00. They explained that consuming these items late in the day disrupts sleep and prevents complete brain recovery, potentially causing premature brain aging over time.
